Reversible open-hearth furnace



C. D. FULLER.

REVERSIBLE OPEN HEARTH EURNACE.

APPLICATION FILED IULY 8. 1920.l

Patented Dee. 14, 1920.

3 SHEETS-SHEET I.

C. D. FULLER. REVERSIBLE OPEN HEARTH FURNACVE.

APPLlcArxoN FILED JULY e, 1920.

1,362,412. v Patented Dec. 14, 1920.

www? #M O gnfuanfoz K@ www C. D. FULLER.

REVERSIBLE OPEN HEARTH FU'fNACE.4

APPLICATION FILED luLY 1920.

1 ,862,441 2, Patented Dec. 1920.

3 SHEET ET 3.

CHARLES D. FULLER, OF LATROBE, PENNSYLVANIA.

REVERSIBLE OPEN-HEARTH FUR-NACE.

Specification of Letters ZPatent. Patented D90, 14, 1920 Applicationfiled July 8, 1920. Serial No. 394,771.

To all whom it may concern Be it known that l, CHARLES D. FULLER, acitizen of the United States, residing at Latrobe, in the county ofTestmoreland and State of Pennsylvania, have invented new and usefulImprovements in Reversible Open-Hearth Furnacesof which the following isa specification.

The invention relates to improvements in open hearth reversiblefurnaces.

The object of the invention is to improve the construction of reversibleopen hearth furnaces and to provide simple, practical and efficientmeans for closing the side passages to the stack after the metal hasbeen melted to retain the heating units within the furnace for assistingin maintaining the metal in the furnace in proper condition until thesame is drawn off or otherwise rcmoved from the furnace whereby amaterial saving in fuel is effected and the melted metal maintained in aproper condition after melting with less fuel than heretofore.

It is also an object of the invention to provide means for reversingthecirculation through the furnace and the passages thereof after the sidepassages have been closed to the stack so that perfect condition of themetal may be maintained with the usual operation with respect to thereversal of thc furnace.

With these and other objects in view, the invention consists in theconstruction and novel combination. of parts hereinafter fullydescribed, illustrated in the accompanying drawings and pointed outinthe claims hereto appended, it being understood that tarif ous changesin the form, proportion, size and minor details of construction, withinthe scope of the appended claims. may beV resorted to without departingfrom the.

spirit of the invention or sacrificingl any of the advantages thereof.

In the accompanying` drawings, in which like numerals of referencedesignate correspending parts in the several figures Figure l is ahorizontal sectional view of a portion of an open hearth reversiblefurnace illustrating one form of the invention.

llig. 2 is a horizontal sectional view of the same taken substantiallyon the line 2 2 of Fig. l. h

F ig. l is atransverse sectional view on the line 3-3 of Fig. l.

Fig. Ll is a horizontal view of a portion of an open hearth reversiblefurnace showing another and simpler form of the invention.

Fig. 5 is a transverse sectional view of the same.

Referring particularly to the form of the invention. illustrated inFigs. l to 3 inclusive of the drawings, l-l designate side passages ofan open heart]` reversible furnace of the standard type leading from thechecker chambers 2 to the stack 3. The checker chambers are connected bythe usual passages on the furnace body or furnace proper a, and the openhearthreversible furnace is operatedin the usual manner and reversedperiodically.

In the original operation of the furnace, air enters the same throughthe air inlet 5 and the furnace is equipped with side .dampers 6 and astach hamper l' and it has a butterfly valve 8 located in the connectingpassage 9 connecting the side passages with the stack 3.

The furnace shown in Figs. 'l to 3 inclusive 1s equipped with anauxiliary air inlet lO having a blower ll provided with a pair ofoutlets l2 diverging forwardly and arranged at an angle to the sidepassages l so as to discharge forwardly into the same. The dischargeoutlets of the blower are shown in the form of tubes-or pipes but theymay be of any desired construction as will be readily understood andpassage of the air through lthe same is controlled by dampers 13 locatedat the outer ends of the pipes or tubes l2 constituting the bloweroutlets.` The arrangen'ient of the blower outlets will enable a currentof air to be directed forwardly at either of the side passages l forcausing a positive circulation through the same in either direction. Theside passages are connected in advance of and adjacent to the blower byan auxiliary transverse passage let equipped with side dampers l5 whichare adapted to be closed in the original oneration of the furnace butwhen the metal in the furnace has been melted, the dampers 6 and 7leading to the stack are closed and the dampers 15 are open. @ne of thedampers 13 is also opened to establish a circulation through the side 1passages, the auxiliary transverse passage 1l and the passages leadingfrom the checker chambers 2 to the furnace body of the furnace properThis will retain the heat within the furnace and prevent the heatclosedto the stack 17. The furnace which isV of the standard type, of whichonly the rear portion is shown for convenience of illustration; thefirst portion being substantially the same as. that heretoforedescribed, 1is equipped with the usual side dampers 18, stack damper 19and a butterfly valve 2O `which is adapted to be arranged on a deadcenter transversely of the furnace as illustrated in Fig. 4 as well vasin its usualv position for reversing the furnace in the originaloperation of the same. The air enters 'at the air inlet 21 and thefurnace is equipped at opposite sides at the rear `ends of the sidepassages 15 with blowers 22 having outlets or passage tubes 23 andcontrolling dampers'24for enabling -either of the blow- -ers to beoperated for causing a circulation through the side passages 15 andtheother passages of the furnace after theside passages 15 have been cutoff from-'the stack. The cut off of the lside passages to the stack atthe damper 19 will retain within the furnace a maximum amount ofheat andwill `save a maximum amount of fuel for maintaining the metal after ithas been melted 1n such condition without permitting a lowering of thetemperature thereof until the" metal is usedand a fresh'charge appliedvto the furnace. The 'blowers 22 are alternately operated and when one isf operated the damper 24 thereofis -open and the damper of the 'otherblower 22 is closed. The direct blowing of the air across the furnace atthe rear end of the passages 15 willvproduce a sufficient circulationthrough the furnace and enable a positive reversal of the circulation tov be produced periodically. The blowers 22 are arranged exteriorly ofthe side passages and other outlets 23 pierce the outer walls of theside passages. The dampers arelocatedlat the inner faces of the outerside walls of the said 'passages 15. Any suitable means may be employedfor operating the dampers. What is -claimed is 1. An open hearthreversible furnace including means for closing the side passages to thevstack, and means for causing a positive auxiliary circulationthroughvthe pas-- sages of the furnace while the said passages u are closed tothe stack.

' 2. An open hearth reversible furnace including means for closing theside passages to the stack, means for causing a positive auxiliarycirculation through the passages ofthe furnace while the said passagesare closed to the stack, and means for reversing the'auxiliarycirculation through the passages of the furnace.

3. An open hearth reversible furnace including means for closing theside passages to the stack, and means for discharging a current of airinto the furnace for producing a positive auxiliary circulation. throughthe passages of the furnace while the side passages are closed 1to thestack.

4. An open hearth reversible furnace including means for closing theside passages tothe stack, and means for discharging a current of airinto the passages of the furnace at either side thereof for producing apositive circulation of air through the passages of the furnace whilethe said passages are closed'to the stack and ,for reversing theauxiliary circulation.

5. An open hearth reversible furnace including means for 'closing theside passages to the stack, and blowers located each at opposite sidesof the furnace and having means for controlling the same for dischargingva current of air into the furnace at either side thereof forv causing apositive auxiliary circulation through the passages of the furnace whilethe same are closed tothe lstack and for reversing the auxiliarycirculation.

6. An open hearth reversiblel furnace including means for closing theside passages to the stack, and blowe'rs located at oppositel sides ofthe rear ends of the side passages and providedwith controlling meansand arranged to discharge across the rear ends ,of the said passages ineither'direction for causing a positive auxiliary circulation throughthe passages of the furnace while the same are closed to the stackand'for reversing the circulation.

7. An open hearth reversible furnace including means for closing theside passages to the stack, and blowers located exteriorly of the rearends of the side passages of the furnace and having outlets piercingthe.

outer walls of the said side passages and arranged to discharge acrossthe same in either direction and provided at the inner faces of theouter side walls of the said passages with damperswhereby a positiveauxiliary circulation is produced through the' passages while the sameare closed to the stack and a reversal of the circulation effected.

In testimony whereof l hereunto affix my signature.

CHARLES D. FULLER.

